CN109207675A - A kind of channel-type induction heating single tube RH purifier and method - Google Patents
A kind of channel-type induction heating single tube RH purifier and method Download PDFInfo
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- CN109207675A CN109207675A CN201811230760.6A CN201811230760A CN109207675A CN 109207675 A CN109207675 A CN 109207675A CN 201811230760 A CN201811230760 A CN 201811230760A CN 109207675 A CN109207675 A CN 109207675A
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- channel
- ladle
- molten steel
- single tube
- vacuum chamber
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Abstract
The invention belongs to technical field of ferrous metallurgy, a kind of channel-type induction heating single tube RH purifier and method are disclosed, for hot donut molten steel in single tube RH refining production, reduces temperature drop.Device includes ladle, vacuum chamber, dip pipe, iron core, coil, water cooling or air cooling device；The top of dip pipe and vacuum chamber, bottom end are inserted into ladle molten steel liquid level or less not in contact with ladle bottom surface；Dip pipe radially opens up channel among top；Iron core is closed hoop structure, sequentially passes through channel and hub of a spool, coil axis is vertical with dip pipe axis, and coil is connected with water cooling or air cooling device.Molten steel is circulated in vacuum chamber, dip pipe, ladle, and heat can be transmitted to single tube RH molten steel everywhere with molten steel flow, and making heating, more uniformly, efficiently heating efficiency is up to 90% or more；Vacuum chamber dross caused by due to introducing nozzle in vacuum chamber side wall is avoided, service life of equipment is extended.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, and in particular to a kind of channel-type induction heating single tube RH purifier and
Process.
Background technique
For the smelting requirements for meeting high-quality steel, external refining becomes one of the important procedure in modern steel production,
And RH SECONDARY REFINING IN A VACUUM CHAMBER has obtained wide because having the advantages that production capacity is big, refining effect is good, process cycle is short in steel mill
General application.Development through over half a century, RH equipment for vacuum refining are gradually expanded to collection degassing by single degassing equipment, taken off
Carbon, desulfurization, temperature-compensating, Composition Control, changes inclusion morphology in the multi-functional purifier of one, especially in life at deoxidation
Significant superiority is shown in terms of producing ultra-low-carbon steel.Nowadays, with the development of society, the demand to high-quality steel gradually increases
Greatly, therefore, how to improve RH refining efficiency, prolong the service life, become a more and more important problem.
Single tube RH purifier (single mouth RH, single tube RH, single-mouth refining furnace) is to retain the original metallurgical function base of tradition RH
On plinth, tedge and down-comer are merged into the dip pipe of a large diameter, and the side-blown argon of tedge is changed to by Ladle Bottom
Bias Argon driving molten steel in portion's circulates.The molten steel that converter or electric furnace smelting obtain is transferred in ladle, is transported through buggy ladle
To the lower section of single tube RH vacuum chamber.When starting refining, dip pipe is inserted into molten steel, while relying on vacuum chamber and argon gas
Driving, so that molten steel is risen certain altitude through dip pipe and enter vacuum chamber and be back to ladle, so that molten steel be made to realize in ladle
Circulating between → dip pipe → vacuum chamber → dip pipe → ladle.Due to the collective effect of high temperature and low pressure, bubble is swollen
Swollen, density reduces, and sprays into vacuum chamber with certain speed, and then deaerate to molten steel.Meanwhile inside molten steel liquid level and molten steel
Sequence of chemical reaction can occur, reduce the content of nonmetalloid in molten steel.Compared with traditional RH, single tube RH purifier can prolong
Long bubble ascending path, increase molten steel circular flow, improve vacuum chamber in molten steel splash, and then can effectively improve refining efficiency,
Extend service life of equipment.
Although single tube RH refining effect is good, it is faced with the problem of molten steel temperature loses in refining process, tapping simultaneously
Temperature, which is reduced, generates adverse effect for the quality of stability and slab to subsequent continuous casting process.Wherein, the temperature loss of RH
It is mainly derived from the radiation of ladle liquid level and ladle, dip pipe heat-loss at wall.To compensate temperature drop, iron and steel enterprise is used now
Vacuum chamber heating molten steel method specifically include that RH-OB method, RH-KTB method, RH-MFB method.
RH-OB method is the RH vacuum oxygen technology of the exploitation of nippon Shi Lan factory in 1972, and this method is in vacuum chamber side
Immersion nozzle is installed, the oxygen blast of molten steel surface accelerates decarburization into vacuum chamber, and the fever such as aluminium, silicon is added and carries out to molten steel on wall
Heating.But oxygen blast nozzle life is low, splash and vacuum chamber dross are serious, and exacerbates the suction pressure of vacuum pump, these are lacked
Point hinders the further development of RH-OB.RH-KTB method is Kawasaki, Japan steel company exploitation in 1989, passes through vacuum chamber top
The water cooled oxygen lance of insertion accelerates decarburization to the oxygen blast of molten steel surface, improves post-combustion rate, reduces temperature drop speed.But this device increases
Add oxygen rifle and its control system, and requires vacuum chamber that there is higher height.RH-MFB method is Nippon Steel's Guang field system in 1993
" multifunctional nozzle " vacuum top blowing oxygen technology that iron is developed supplies combustion gas or oxygen from top blow oxygen lance, is not only preheated,
It is also heated with combustion gas in RH processing.While heating up to molten steel, the dross object of vacuum chamber interior walls formation can be removed,
The sealing requirements of top gun vacuum sealing device are higher, and existing production practices show often to occur that clinker is more, technique is uncoordinated
The problems such as.
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of channel-type induction heating single tube RH purifier and technique side
Method.Technical scheme is as follows:
A kind of channel-type induction heating single tube RH purifier, including ladle, vacuum chamber, dip pipe, iron core, coil, water
Cold or air cooling device；The top of dip pipe and vacuum chamber, bottom end are inserted into ladle molten steel liquid level or less not in contact with Ladle Bottom
Face；Dip pipe radially opens up channel among top；Iron core is closed hoop structure, sequentially passes through channel and hub of a spool, line
Coil axis is vertical with dip pipe axis, and coil is connected with water cooling or air cooling device.
Another scheme is that above-mentioned channel is opened up along vacuum chamber intermediate radial.
Above-mentioned channel is cylindrical or lower wedge structure.The argon gas or dip pipe side wall that ladle bottom bias can be made to be blown into
The argon gas being blown into is flowed along a certain side of channel outer wall；The specific type of furnace of the selection gist single tube RH of channel sized and shape and
Depending on vacuum-chamber dimensions.
On the steel shell that above-mentioned passway connects, it is equipped with one week joint-cutting along dipping pipe shell radial circumference, reduces in steel shell
Eddy-current loss.
The ladle need to have steel ladle cover, to completely cut off coil and molten steel, protect coil, while can protect to ladle molten steel
Temperature.
The material of the iron core is the soft magnetic materials of high permeability, and the gap between iron core and channel is filled out by refractory material
Fill fixation；Iron core size is formulated according to the size and coil power in channel, the preferred silicon steel sheet of material.
The texture of coil is acid bronze alloy, including fine copper, red copper, the outside of vacuum chamber is placed in, with water cooling or air-cooled dress
It sets and is connected；The heating power of coil is 1~10000KW, specifically depending on operating condition.
A kind of channel-type induction heating single tube RH fining process is using above-mentioned apparatus, according to following processing step
It carries out:
(1) equipment is in place: dip pipe being inserted into ladle molten steel by apparatus for controlling of lifting；
(2) Argon: ladle bottom bias is blown into argon gas or dip pipe side wall is blown into argon gas, using airlift pump principle, passes through
Argon Bubble drives molten steel, reaches vacuum chamber through dip pipe from ladle and is then refluxed for ladle, makes molten steel in ladle, dip pipe, true
It generates and circulates between empty room；
(3) cooling: to open water cooling or air cooling device and cool down to coil, prevent coil when subsequent energization from overheating；
(4) be powered: be passed through alternating current in coil, make to generate alternating flux in iron core, wherein size of current be 1~
10000A, frequency are 1~10000Hz；
(5) subsequent processing: after the completion of to be refined, stop being powered, and stop water cooling or air cooling device, molten steel be introduced next
A process.
Beneficial effects of the present invention:
(1) according to the working principle of transformer, coil is passed through alternating current and generates alternating flux in the iron core of closure, into
And induced electromotive force is generated in molten steel, molten steel conduction generates induced current, generates Joule heat and heats molten steel.Using the present invention,
LF stove heating process before RH refining treatment can be omitted for part steel grade reduces temperature drop loss and refining link, after making
Continuous continuous casting process is more stable；
(2) molten steel circulates between vacuum chamber, dip pipe, ladle, and heat can be transmitted to single tube RH with molten steel flow
Molten steel everywhere, making heating, more uniformly, efficiently heating efficiency is up to 90% or more；
(3) when the steel shell of passage proximate is placed in alternating magnetic field, induced current is also easy to produce in steel shell, and electric current closes in steel shell
It closes, and has the joint-cutting to round among the steel shell of passage proximate involved in the present invention, the vortex damage in steel shell can be effectively reduced
Consumption；
(4) circle or lower wedge channel of dip pipe or vacuum chamber are conducive to guide ladle bottom blowing or dip pipe side-blown
Argon gas enter the same side of dip pipe；
(5) it is not required to introduce the exothermic mixtures such as aluminium, silicon into vacuum chamber molten steel, caused by avoiding because adding aluminium plus silicon heating
The generation of field trash does not introduce other substances into molten steel, improves quality of molten steel；
(6) it is not required in vacuum chamber side wall or top installation nozzle, oxygen rifle dispatch control system, design is relatively simple, is easy to grasp
It controls；
(7) vacuum chamber dross caused by due to introducing nozzle in vacuum chamber side wall is avoided, service life of equipment is extended.
Detailed description of the invention
Fig. 1 is the agent structure schematic diagram of channel-type induction heating single tube RH purifier of the invention, wherein channel position
Among dip pipe；
Fig. 2 is the agent structure schematic diagram of channel-type induction heating single tube RH purifier of the invention, wherein channel position
Among vacuum chamber；
Fig. 3 is the main view of Fig. 1；
The top view of Fig. 4 bitmap 1；
Fig. 5 is the agent structure schematic diagram of coil and iron core；
Fig. 6 is the top view of dip pipe or vacuum chamber；
Fig. 7 is the main view for having cylindrical channel and neighbouring steel shell；
Fig. 8 is the main view for having lower wedge channel and neighbouring steel shell；
Fig. 9 is the main view of ladle；
Figure 10 is the flow diagram of channel-type induction heating single tube RH fining process of the invention；
Argon Bubble distribution schematic diagram in single tube RH purifier when Figure 11 is blown into argon gas for ladle bottom；
Argon Bubble distribution schematic diagram in single tube RH purifier when Figure 12 is blown into argon gas for dip pipe side wall；
Figure 13 is the main Eddy Distribution schematic diagram that electromagnetic field is simulated.
In figure, 1 ladle；2 dip pipes；3 vacuum chambers；4 iron cores；5 coils；6 water coolings or air cooling device；7 molten steel；8 fire proofed woods
The bed of material；9 steel shells；10 cylindrical channels；The channel of 11 lower wedges；12 joint-cuttings；13 steel ladle covers.
Specific embodiment
An embodiment of the present invention is described further in the following with reference to the drawings and specific embodiments.
Embodiment
A kind of channel-type induction heating single tube RH purifier, as shown in FIG. 1 to FIG. 9, including it is ladle 1, dip pipe 2, true
Empty room 3, iron core 4, coil 5, water cooling or air cooling device 6, molten steel 7, refractory material layer 8, steel shell 9, cylindrical channel 10 or lower part
Wedgy passage 11, joint-cutting 12, steel ladle cover 13.Wherein, dip pipe 2 be cylindrical structure, one end be inserted into ladle 1 in, the other end with
Vacuum chamber 3 is connected；Iron core 4 passes through channel around dip pipe 2 or vacuum chamber 3；Coil 5 is wrapped on iron core 4, is located at dip pipe 2
Or the outside of vacuum chamber 3, and coil 5 is connected with water cooling or air cooling device 6；Steel ladle cover 13 is covered in the top of ladle 1.
There is the channel 11 of horizontal perforative cylindrical channel 10 or lower wedge in the dip pipe 2 or vacuum chamber 3, can make
The argon gas that the argon gas or 2 side wall of dip pipe that 1 bottom bias of ladle is blown into are blown into is along 10 outer wall of cylindrical channel or lower wedge
It flows a certain side of 11 outer wall of channel.
The dip pipe 2 or vacuum chamber 3 are successively molten steel 7, refractory material layer 8, steel shell 9 from the inside to the outside, are had among steel shell 9
The joint-cutting 12 to round reduces the eddy-current loss in steel shell 9.
The material of the iron core 4 is silicon steel sheet, and the sky between iron core 4 and cylindrical channel 10 or lower wedge channel 11
Gap is filled by refractory material.
The material of the coil 5 is red copper, and the heating power of coil 5 is 500KW.
The axis of the coil 5 is vertical with the holding of the axis of vacuum chamber 3.
The water cooling or air cooling device 6 be in order to reduce be powered after coil 5 temperature, prevent heating molten steel process coil
5 overheats.
High-temperature molten steel can heat iron core 4 and coil 5 by modes such as heat radiations, and the steel ladle cover 13 is covered in steel
The top of packet 1 is to protect the heating devices such as iron core 4 and coil 5 in order to which iron core 4, coil 5 to be isolated with the molten steel in ladle 1.
A kind of channel-type induction heating single tube RH fining process be using above-mentioned apparatus, according to following processing step into
Row, process signal are as shown in Figure 8:
(1) equipment is in place: dip pipe 2 being inserted into the molten steel of ladle 1 by apparatus for controlling of lifting；
(2) Argon: 1 bottom bias of ladle is blown into argon gas or 2 side wall of dip pipe is blown into argon gas, using airlift pump principle, leads to
Argon Bubble driving molten steel is crossed, vacuum chamber 3 is reached through dip pipe 2 from ladle 1 and is then refluxed for ladle 1, makes molten steel in ladle 1, leaching
It generates and circulates between stain pipe 2, vacuum chamber 3；
(3) cooling: to open water cooling or air cooling device 6 and cool down to coil 5, prevent coil 5 when subsequent energization from overheating；
(4) be powered: be passed through alternating current in coil 5, make to generate alternating flux in iron core 4, wherein size of current be 1~
10000A；
(5) subsequent processing: after the completion of to be refined, stop being powered, and stop water cooling or air cooling device 6, molten steel is introduced down
One process.
In the present embodiment the principle of channel-type induction heating single tube RH purifier and process can specific explanations it is as follows:
Dip pipe 1 to be inserted into the molten steel of ladle 2 by apparatus for controlling of lifting, 1 bottom bias of ladle is blown into after argon gas,
Using airlift pump principle, the effect for driving molten steel and 3 top of vacuum chamber to vacuumize by Argon Bubble, make molten steel ladle 1,
It is circulated between dip pipe 2, vacuum chamber 3.Coil 5 is passed through after alternating current, can passed through according to the working principle of transformer
It wears in iron core-closed the 4 of vacuum chamber 3 and generates alternating flux, ladle 1, dip pipe 2, the molten steel in vacuum chamber 3 constitute time at this time
Grade coil.Therefore, molten steel circuit can produce induced electromotive force under the action of electromagnetic field, and molten steel conduction generates induced current.By
Molten steel can be heated by generating Joule heat there are resistance in molten steel.
Motion profile of the Argon Bubble in molten steel is set forth in Figure 11 and Figure 12.In the invention device, when 1 bottom of ladle
The Argon Bubble that eccentric or 2 side wall of dip pipe is blown into enters molten steel, when moving to passage proximate, can by cylindrical channel 10 or under
The shape constraining of portion's wedgy passage 11 acts on, and moves Argon Bubble along certain side of channel outer wall, to drive molten steel in steel
It wraps and is circulated between 1, dip pipe 2, ladle 3, heat can be transmitted to single tube RH molten steel everywhere with molten steel flow, make heating more
Uniformly, efficiently.
It is led according to Faraday's electromagnetic induction law when blocky conductor is placed in alternating magnetic field or moves in fixed magnetic field
Induced current is generated in vivo, this electric current is closed in conductor, referred to as eddy current effect.In the invention device, in iron core 4 and coil 5
Under the action of the alternating magnetic field of generation, it can produce inside the steel shell 9 near cylindrical channel 10 or lower wedge channel 11
Induced current, i.e. eddy current effect.Figure 13 is the main Eddy Distribution schematic diagram simulated according to electromagnetic field, and 4 in figure return
Stream area can indicate faradic flow direction.As seen from the figure, the steel shell near cylindrical channel 10 or lower wedge channel 11
If seemless 12 in can generate biggish induced current, and then lead to energy loss i.e. eddy-current loss.Therefore, logical in cylinder
A joint-cutting 12 is arranged in the middle part of steel shell 9 near road 10 or lower wedge channel 11, can effectively obstruct faradic flowing, subtract
Few eddy-current loss.
It is of the present invention that the examples are only preferred embodiments of the present invention is described, not to present inventive concept and
Range is defined.In addition to it can produce heating effect to single tube RH molten steel described in embodiment, also help accelerate alloying into
Journey is conducive to inclusion removal etc..Under the premise of not departing from design philosophy of the present invention, engineers and technicians are to this hair in this field
The all variations and modifications that bright technical solution is made should all fall into protection scope of the present invention.
Claims (10)
1. a kind of channel-type induction heating single tube RH purifier, which is characterized in that including ladle, vacuum chamber, dip pipe, iron
Core, coil, water cooling or air cooling device；The top of dip pipe and vacuum chamber, bottom end are inserted into ladle molten steel liquid level or less not
Contact ladle bottom surface；Dip pipe radially opens up channel among top；Iron core is closed hoop structure, sequentially passes through channel and line
Circle center, coil axis is vertical with dip pipe axis, and coil is connected with water cooling or air cooling device.
2. channel-type induction heating single tube RH purifier described in claim 1, which is characterized in that the channel is along vacuum chamber
Intermediate radial opens up.
3. channel-type induction heating single tube RH purifier according to claim 1 or 2, which is characterized in that the channel
For cylindrical or lower wedge structure.
4. channel-type induction heating single tube RH purifier according to claim 1 or 2, which is characterized in that passway phase
On the steel shell connect, one week joint-cutting is equipped with along dipping pipe shell radial circumference.
5. channel-type induction heating single tube RH purifier according to claim 3, which is characterized in that passway connected
On steel shell, one week joint-cutting is equipped with along dipping pipe shell radial circumference.
6. channel-type induction heating single tube RH purifier described according to claim 1 or 2 or 5, which is characterized in that the iron
The material of core is the soft magnetic materials of high permeability, and the gap between iron core and channel is filled by refractory material and fixed.
7. channel-type induction heating single tube RH purifier according to claim 3, which is characterized in that the material of the iron core
Matter is the soft magnetic materials of high permeability, and the gap between iron core and channel is filled by refractory material and fixed.
8. channel-type induction heating single tube RH purifier according to claim 4, which is characterized in that the material of the iron core
Matter is the soft magnetic materials of high permeability, and the gap between iron core and channel is filled by refractory material and fixed.
9. channel-type induction heating single tube RH purifier described according to claim 1 or 2 or 5 or 7 or 8, which is characterized in that
The ladle needs to cover.
10. the application method of any channel-type induction heating single tube RH purifier of claim 1-9, feature exist
In including the following steps:
(1) equipment is in place: dip pipe is inserted into ladle molten steel；
(2) Argon: ladle bottom bias is blown into argon gas or dip pipe side wall is blown into argon gas, using airlift pump principle, passes through argon gas
Bubble driving molten steel, reaches vacuum chamber through dip pipe from ladle and is then refluxed for ladle, make molten steel in ladle, dip pipe, vacuum chamber
Middle generation circulates；
(3) cooling: to open water cooling or air cooling device and cool down to coil, prevent coil when subsequent energization from overheating；
(4) it is powered: being passed through alternating current in coil, make to generate alternating flux in iron core, wherein size of current is 1~10000A,
Frequency is 1~10000Hz；
(5) subsequent processing: after the completion of to be refined, stop being powered, and water cooling out of service or air cooling device, molten steel be introduced next
A process.
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| CN201811230760.6A CN109207675B (en) | 2018-10-22 | 2018-10-22 | A kind of channel-type induction heating single tube RH purifier and method |
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| CN201811230760.6A CN109207675B (en) | 2018-10-22 | 2018-10-22 | A kind of channel-type induction heating single tube RH purifier and method |
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| CN109207675B CN109207675B (en) | 2019-09-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114891958A (en) * | 2022-05-31 | 2022-08-12 | 东北大学 | Multifunctional induction heating RH refining device and method |
| CN115305316A (en) * | 2022-08-18 | 2022-11-08 | 日照钢铁控股集团有限公司 | RH single-connection ultra-low carbon steel production method for sheet billet continuous casting and rolling production line |
| CN115323121A (en) * | 2022-08-18 | 2022-11-11 | 日照钢铁控股集团有限公司 | Smelting process of low-carbon low-sulfur steel for thin slab continuous casting and rolling production line |
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|---|---|---|---|---|
| JPS61130415A (en) * | 1984-11-29 | 1986-06-18 | Kawasaki Steel Corp | Heating method of molten steel in vacuum degassing device |
| CN105567908A (en) * | 2016-01-18 | 2016-05-11 | 东北大学 | Double-tube type electromagnetic induction RH device and method for heating molten steel and removing inclusions |
| CN106929636A (en) * | 2017-04-05 | 2017-07-07 | 山东钢铁股份有限公司 | A kind of RH refining furnaces dip pipe for heating molten steel and heating molten steel method |
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2018
- 2018-10-22 CN CN201811230760.6A patent/CN109207675B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61130415A (en) * | 1984-11-29 | 1986-06-18 | Kawasaki Steel Corp | Heating method of molten steel in vacuum degassing device |
| CN105567908A (en) * | 2016-01-18 | 2016-05-11 | 东北大学 | Double-tube type electromagnetic induction RH device and method for heating molten steel and removing inclusions |
| CN106929636A (en) * | 2017-04-05 | 2017-07-07 | 山东钢铁股份有限公司 | A kind of RH refining furnaces dip pipe for heating molten steel and heating molten steel method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114891958A (en) * | 2022-05-31 | 2022-08-12 | 东北大学 | Multifunctional induction heating RH refining device and method |
| CN115305316A (en) * | 2022-08-18 | 2022-11-08 | 日照钢铁控股集团有限公司 | RH single-connection ultra-low carbon steel production method for sheet billet continuous casting and rolling production line |
| CN115323121A (en) * | 2022-08-18 | 2022-11-11 | 日照钢铁控股集团有限公司 | Smelting process of low-carbon low-sulfur steel for thin slab continuous casting and rolling production line |
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| Publication number | Publication date |
|---|---|
| CN109207675B (en) | 2019-09-27 |
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